Yellow azo dye.



are after being dried and pulverized in the anisidin are dissolved in 9000 parts of water.

flb lhosgen is introduced into this solution amino snares mama oreicn.

OSCAR GId'NTHER AND LEOPOLD HESSE, OF ELBERFELD, GERMANY, ASSIGNORS TO FARBENFABILIKEN VORM. FRIEDR. BAYER 5 (10., OF ELBERFELID, GERMANY, A

CORPORATION OF GERMANY) YELLOW AZO DYE.

easel.

No Drawing.

.at .Elbert'eld, Germany, have invented new and useful Improvements in New Dyestutl,

of which the following is a specification.

Our invention relates to the manufacture and production of new azo dyestuti's capable -.of'dyeingunmordanted cotton yellow shades fast to light. The: process for their production consists in converting carboxyhc acids of annnoazo compounds of the benzene series The new dyes shape of their alkaline salts dark yellow powderSsolublc in water with a yellow and soluble in concentratedsulfuric acid with a reddish color. Upon reduction with stannous chlorid and hydrochloric acid an aminocarboxylic acid of the benzene series and an urea of a dlannn is obtained which is split up into carbonic acid and diamin.

To illustrate our process we can proceed as follows, the parts being by weight :-58(3 parts of the sodium salt of the aminoazo dyestutt: meta-ainniobenzoic acid orthowhich has to be stirred and kept alkaline until the production of the urea is complete. The new dye is after being dried and pulwerized in the shape of its sodium salt a yellow-brown powder soluble in water with a yellow color and soluble in concentrated sulfuric acid witha red color; yielding u on reduction with stannous chlorid and hy '0- chloric acid meta-aminobenzoic acid and the urea of para-amino-ortho-anisidin which is further decomposed into 2-meth0Xy-paraphenylenediamin and carbonic acid. It dyes cotton greenish-yellow shades fast to light.-

Specification of Letters Patent.

Patented Sept. 28, 1909.

Application filed May '4, 1909. Serial No. 493,773.

The process is earried out in an analogous manner on using other of the above mentioned aminoazo compounds.

What we claim is.

1. The herein described new dyestuffs being areas of earboxylie acids'of aminoazo compounds obtainable from amino-carboxylic acids of the benzene series and'amins which dyes are after being dried and pulverized in the shape of their alkaline salts dark yellow powders soluble in water with a yellow and soluble in concentrated sulfuric acid with a reddish-color; yielding upon re duction with stannous chlorid and hydrochloric acid an an1ino-carboxylic acid of the benzene series and an urea of a diainin which is further decon'iposed into carbonic acid and a diamin; dyeing eotton ycllow shades, substantially as described.

2. The herein described new dyestuft being the urea of the axe compound obtainable .from meta-aminobenzoic acid and orthoanisidin. hich is after being dried and plll: verized in the shape. of its sodium salt a yellow-brown powder soluble in water witha yellow color and soluble in concentrated sulfuric acid with a red color; yielding upon reduction with stannous chlorid and hydrochloric acid meta-a1ninobenzoic acid and the urea of para-amino-ortho-anisidin which is further decomposed into Q-methoxy-para- .phenylenediamin and carbonic acid; dyeing cotton greenish-yellow shades fast to light, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

OSCAR GUNTHER. 1.. 5.]. w LEoPoLo HESSE. 1.8.] 

